Poiseuille’s Law

Poiseuille’s law for resistance

Resistance to laminar flow of an incompressible fluid in a tube. This formula is provided solely for hypothetical demonstration only.

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Contrast Media	Viscosity (cP) @ 37°C
Isovue 370	9.4
Omnipaque 350	10.4
Optiray 350	9.0
Vispaque 320	11.8

This is what you may feel with your hand using syring injection.

SoftNAV, 4F
Resistance	=	8	x	Viscosity	x	Length	÷	3.14	x	Radius4
	=	8	x		x		÷	3.14	x
	gram(s)/centimeter/second
	1 centipoise = 0.01 gram/centimeter/second
Competitor, 4F
Resistance	=	8	x	Viscosity	x	Length	÷	3.14	x	Radius4
	=	8	x		x		÷	3.14	x
	gram(s)/centimeter/second
	1 centipoise = 0.01 gram/centimeter/second
SoftNAV, 5F
Resistance	=	8	x	Viscosity	x	Length	÷	3.14	x	Radius4
	=	8	x		x		÷	3.14	x
	gram(s)/centimeter/second
	1 centipoise = 0.01 gram/centimeter/second
Competitor, 5F
Resistance	=	8	x	Viscosity	x	Length	÷	3.14	x	Radius4
	=	8	x		x		÷	3.14	x
	gram(s)/centimeter/second
	1 centipoise = 0.01 gram/centimeter/second


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